Basement structural control in the Magallanes-Malvinas Fold and Thrust Belt, offshore Argentina
| Autor: | José Ignacio Isola, Alejandro Alberto Tassone, Marco Menichetti, Juan Pablo Ormazabal, Emanuele Lodolo, Fermin Ignacio Palma, Jorge Gabriel Lozano, Federico Damián Esteban |
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| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
geography geography.geographical_feature_category Anticline Geology Fold (geology) 010502 geochemistry & geophysics 01 natural sciences Tierra Paleontology Tectonics Fold and thrust belt Seismic line Submarine pipeline Piggyback basin 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of South American Earth Sciences. 103:102708 |
| ISSN: | 0895-9811 |
| DOI: | 10.1016/j.jsames.2020.102708 |
| Popis: | In this study, we examine the external part of the Magallanes-Malvinas Fold and Thrust Belt in offshore areas, including a portion in Tierra del Fuego onshore, in southern South America. Our investigations focus on the interaction between a thin-skinned fold and thrust belt and the basement in that deformation, considering pre-existing structures acting as stress risers and localizing a possible tectonic inversion. The data is composed of around 14,000 km of 2-D multichannel seismic lines and three exploratory wells, used to analyse the anticlines of the fold and thrust belt in the area. The strike of these folds progressively evolves from NW-SE trending in western onshore regions, to WSW-ENE trending in eastern offshore areas. The fold and thrust belt shows a buttressing effect against the Rio Chico Arch. The most shortening is seen in the apex of the Rio Chico Arch around 67° W, in the coast of Tierra del Fuego, and gradually decreases eastwards in offshore regions. A connection between basement-involved faults and folds offshore is inferred from the analysis of the Geminis and Ciclon anticlines, developed during the N–S last compressional stage of deformation in the late Oligocene/early Miocene. The Geminis anticline is a fault propagation fold with a total shortening of 205 m with a piggyback basin developed over its backlimb. The location and ENE-WSW strike-direction of the fold have been controlled by a basement-involved fault. The Ciclon anticline is a subtle fold trending WNW-ESE developed as a result of the slight tectonic inversion of a negative flower structure. |
| Databáze: | OpenAIRE |
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